Overhead trolley system



July 13 1926. 1,592,369

0. M. JORSTAD OVERHEAD 'TROLLEY SYSTEM Filed April '7. 1922 2 Sheets-Sheet 1 July 13 192s. I 1,592,369

' O.M.JOR$TAD OVERHEAD TRGLLEY SYSTEM Filed April 7, 1922 2 Sheets-Sheet 2 Osmana M. Jansfaa.

Q I BY I Patented July 13, 1926.

UNl-TED" STATES.

PAT ENT OFFICE. I

OSMUND M. JORSTAD, EAST FITTSBURGH, PENNSYLVANIA, ASSIGNOR T WEST- INGHOUSE ELECTRIC & MANUFACTURING COMPANY, ,A C29385EOIl'iQAJIION OF PENN-c SYLVANIA.

Application filed April 7,

Anotherobject of myinvention is to pro- I vide means for automatically compensating iii) for changes in the loading of such contact conductors.

A thirdobject of my invention is to so position thecompensating means in the overhead trolley system that it will not cause any irregularities in the under running surface of the contact wire.

Still another object of my invention is to provide a rugged and simple overhead trolley system thatshall be economical of construction and positive and reliable in operation. V I

Briefly speaking, my invention consists in providing flexible or adjustable'means, or both, for the contact Wire to balance changes in loading thereon caused by changes in temperature, wind-pressure, andsnow and ice loading. 7 by For a better understanding of my invention, reference may be made to the accompanying drawings,

' Figure 1 of which is a View, in side elevation, of a portion of a trolley system constructed in accordance with my invention;

Figs. 2 and 3 are views, partly in side elevation and partly in section, of devices employed in-the overhead trolley system illustrated in Fig. 1; so

Fig. 4 is a view, similar to Fig. 1, of a modified form of overhead trolley system in which my invention is employed; and Figs. 5 and 6 areviews.v in plan and in side elevation, respectively, of a plurality of conductorsthat are illustrated in Fig. l of the drawing. I v

. Referring particularly to Fig. 1 of the drawings, a plurality of trolley conductors i and 2, whic'h alternately serve asm'essenger cables" and as contact wires, are suspended, cue from nether, amass of, a. plu l y OVERHEAD TROLLEY SYSTEM.

1922. Serial Ila-550,362.

of hangers 3 andboth are supported from a main cable 18 by means of a plurality of hangers 19. The main cable 18 is suspended from supporting structures 1; by means of suitable insulators 5.- Springs (imay be attached to the cables at points just removed from the plane of the traveling contact de. vice or they may be employed to secure the trolley conductors to the hangers 19. H

Each of the springs 6, (see Fig. 2) comprises a body member 8, a cap 9 provided withan eye 10 and a movable guide memberll, having a rod 12 secured thereto. At

the opposite end'of thelrod 12 is an eye 13. Themovable member 11 is biased to- "ward the cap member 9 by ahelical spring 14. The spring 14 may also serve to eleca trically connect the body member 8 tothe movable member 11. I

The turnbuckle device 7 (see Fig. 3), comprises-two threaded bolts 15, mounteol in a threaded holding member 16; Each of the bolts 15' is provided with an eye 17. In

usual practice, a flexible shunt connection" around. each of the springs 16 and turnbuckle devices 7 would be provided.

Spring 6 may also be positioned in the messenger cable at points midway between the hangers 19, if such position isfound to be more satisfactory for the particular system that is constructed. Turnbuckles 7 may be substituted for the springs 6 but will not provide the automatic compensation for changes in loading that is elfected when the springs 6 are employed. However, the turnbuckle 7 and springfi, together, would-be most satisfactory where the trolley systemis subjected to extreme'variations in tem perature and loading and; where the turnbuckles may be readily adjusted;

For a better understanding of how the trolley conductors 1 and 2 are positioned, reference may be made to Figs. 5 and 6 ofthe drawings, which illustrate the manner in which the trolley conductor 1 changes from a contact wire to a messenger cable atthe same time that trolley conductor 2 changes from .a messenger cable to a contact wire. It is to be understood that a material may be employed for the conductorsland 2, at places where they serve as contact wires, that is different from the material employed where they function as messenger cables.

It is to be understood that the invention is equally applicable to systems where a plurality of trolley conductors are employed to simultaneously supply a relatively large value of current to a movable contact device, such, for example, as a pantograph. In such a ase, the wires will be suspended in parallel relation, one to another.

Referring to Fig. 4cof the drawings, the weight of the spring 6 may be removed from the trolley conductor that serves as a messenger cable at any given location by having the spring 6 suspended from the insulator 5 by means of a plurality of tension members :21 that are movably secured to ahanger From the above description, it is apparent that the adjustable devices provided by my invention for an overhead trolley system may be so arranged as to materially lessen the change in stress that occurs when the trolley system is subjected to great variations in loading because of changes in temperature, snow, wind or ice loading. It is also apparent that these devices may be placed at points in the trolley system that differ from those illustrated, without depart-ing from the spirit of the present invention. It is desired, therefore, that my invention be limited only by the scope of the appended claims, as expressed by their terms.

I claim as my invention 1. In a trolley system, the combination with a main cable and means for support-- ing said main cable, of a plurality of trolley conductors, means for alternately supporting one of said conductors from another. means for suspending said conductors from said cable, and resilient means secured to said conductors to compensate for changes in the loading thereof.

2. In a trolley system, the combination with a main cable, and means for supporting said main cable, of a plurality oi trolley conductors, means for alternately supporting one of said conductors from another, means for sits-penning said conductors from said cable, and flexible means secured to said conductors to compensate for changes in the loading thereof.

3. In a trolley system, the combination with a main cable, andmeans for supporting said main cable, of a plurality of trolley conductors, means for alternately supporting one of said conductors from another, means for suspending said conductors from said cable, and adjustable means secured to said conductors to com- 'nensate for changes in the loiidin-g thereof.

i. In a trolley system, the combination with a main cable, and means torsupporting said main able, of a plurality of trolley conductors, means for alternately supporting one of said conductors from another, means for suspending said conductors "from said cable, and a spring secured to one of said conductors to compensate for changes in the loading thereof.

In a trolley system, the combination with a main cable, and means for supporting said main cable, of a plurality of trolley conductors, means for alternately supporting one of said conductors from another, means for suspending said conductors from said cable, and a turnbuckle secured to one oi said conductors to compensate "for changes in the loading thereof.

6. In a trolley system, the con'ibination with a main cable, and means for supporting said main cable, 01 a plurality of trolley conductors, means for alternately supporting one of said conductors from another, a plurality of hangers tor suspending said conductors from said cable, and a spring attached to one of said conductors between said hangers to compensate for changes in the loading of said conductors.

7. In a trolley system, the combination with a main cable, and means for supporting said main cable, of a plurality of trolley conductors, means for alternately supporting one of said conductors from another, a plurality of hangers for suspending said conductors from said cable, and a turnbuckle attached to one of said conductors between said hangers to compensate for changes in the loading of said conductors.

8. In a trolley system, the combination with a main cable, and means for supporting said main cable, of a plurality of trolley conductors, means for alternately supporting one of said conductors from another, a plurality of hangers tor suspending said conductors from said cable, and a spring for securing one off said conductors to said hanger.

9. In a trolley system, the combination with a main cable, and means for supporting said main cable, of a plurality of trolley conductors, means for alternately support ing one of said conductors from another, a plurality of hangers tor suspending said conductors from said cable, and a turnbuckle for securing one of said conductors to said hanger.

10. In a trolley system, the combination with a main cable, of a messenger cable, a plurality of hangers for securing said messenger cable to said main cable, a contact wire, a plurality of hangers for securing said wire to said messenger cable, a spring attached to said messenger cable, a plurality of tension members for supporting said sprin -and a hanger for supporting-said tension members.

112' In a trolley system, the combination til with a main cable, of a messenger cable, a said turnbuckle and a hanger for SUPPOl'tplurality of hangers for securing said 1ne..- ing said tension members.

sengei' cable to said main cable, a contact In testimony whereof. I have hereunto 9 wire, a plurality of hangers for securing subscribed my name this-27thdny of March, said Wire to said messenger cable, a turn-' 1922.

buckle attached to said messenger cable, a I i I e plurality of tension'members for supporting 7 ()SMUND M. JOB-STAB. 

